I think it would be Positive
Answer:
experiment
Explanation:
When you are controlling the conditions it is called an experiment.
If scientists believe that the newly discovered gene has two alleles A and a and that the alleles show incomplete dominance, the best way to prove this is to look for subjects who are homozygous with respect to the different alleles. The offsprings will all have the genotype of Aa and if indeed, the alleles show incomplete the dominance, the traits of the first generation will not manifest completely but a mixture of two will.
Black for the first,
Brown for the second,
And,
White for the third.
Hope that his helps you..
